diff --git a/configure.ac b/configure.ac
index b132499..b40bbef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -325,12 +325,14 @@ AC_ARG_ENABLE([gcrypt],
                 [have_gcrypt=auto])
 
 if test "x${have_gcrypt}" != xno ; then
-        AM_PATH_LIBGCRYPT(
+        m4_ifdef([AM_PATH_LIBGCRYPT],
+                [AM_PATH_LIBGCRYPT(
                 [1.4.5],
                 [have_gcrypt=yes],
                 [if test "x$have_gcrypt" = xyes ; then
                         AC_MSG_ERROR([*** GCRYPT headers not found.])
-                fi])
+                fi])],
+                [have_gcrypt=no])
 
         if test "x$have_gcrypt" = xyes ; then
                 GCRYPT_LIBS="$LIBGCRYPT_LIBS"